#include<fstream.h>
ifstream f("fractii.in");
ofstream g("fractii.out");
long i,nr,nnr,n,x;
int main()
{
f>>n;
nr=n*n;
for(i=2;i<=n;i++)
{
x=i;
nnr=1;
while(x*i<=n)
{
nnr++;
x=x*i;
}
if(nnr==1)
nr=nr-1;
else
nr=nr-2*nnr+1;
}
g<<nr<<"\n";
f.close();
g.close();
return 0;
}